I have a coworker who, at least a few times a week, has terrible B.O. I am positive he doesn't use deodorant and I'm not sure how regularly he showers. It's awful. If he spends any time in my office, after he leaves, I spray perfume onto a tissue and hold it to my nose because otherwise, the B.O. smell makes me feel sick. Something like 15 years ago, our COO at the time regularly had to have our HR person talk to him about hygiene, but nothing ever changed. It's a shame, because he's a nice man, and the first thing anyone thinks about him is that he stinks. He's married, so I guess his wife doesn't mind. Or she smells, too.